#define _CRT_SECURE_NO_WARNINGS 1
#include <iostream>
#include <vector>
using namespace std;

class Solution1 {
public:
    int numberOfArithmeticSlices(vector<int>& nums) {
        int n = nums.size();

        vector<int> dp(n);

        int ret = 0;
        for (int i = 2; i < n; ++i)
        {
            dp[i] = nums[i] - nums[i - 1] == nums[i - 1] - nums[i - 2] ? dp[i - 1] + 1 : 0;
            ret += dp[i];
        }
        return ret;
    }
};

class Solution2 {
public:
    int maxTurbulenceSize(vector<int>& arr) {
        int n = arr.size();
        vector<int> f(n, 1), g(n, 1);

        int ret = 1;
        for (int i = 1; i < n; ++i)
        {
            if (arr[i] < arr[i - 1])
                f[i] = g[i - 1] + 1;
            else if (arr[i] > arr[i - 1])
                g[i] = f[i - 1] + 1;

            ret = max(ret, max(f[i], g[i]));
        }
        return ret;
    }
};

int main()
{

	return 0;
}